Sidelink COT Resource Allocation to Reduce LBT Failures
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Solution Overview
Problem
The allocation of sidelink transmission resources by network devices in 3GPP 5G NR can lead to listen-before-talk (LBT) failures among user equipment (UEs), reducing spectrum efficiency due to gaps introduced for LBT, which can be several symbols to several slots.
Innovation Solution
A network device allocates resources within a channel occupancy time (COT) initiated by a first UE, taking into account information from multiple UEs to optimize resource allocation and minimize LBT interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap is introduced for the second UE to perform LBT without being impacted by the first transmissions, then LBT failure is avoided, but spectrum efficiency seriously decreases
Solution Approach 1:
The patent segments the channel occupancy time into multiple sub-periods, allowing different UEs to perform LBT and transmit in separate time windows within the same COT. This divides the previously monolithic gap requirement into smaller, more efficient time segments that reduce overall resource waste while ensuring successful LBT for multiple UEs.
Solution Approach 2:
The patent implements periodic LBT opportunities within the COT structure, where UEs are allocated specific time periods to perform LBT and transmit. This periodic arrangement allows systematic management of LBT attempts across multiple UEs without requiring continuous gaps, thereby improving spectrum efficiency while maintaining reliable channel access.
2Productivity
If the first UE performs transmissions on the allocated resources, then the first UE utilizes the channel successfully, but LBT performed by a second UE is impacted and causes LBT failure
Solution Approach 1:
The patent segments the COT into multiple transmission opportunities with interspersed LBT windows. This allows the first UE to transmit in one segment while providing dedicated time windows for the second UE to perform LBT in subsequent segments, preventing LBT failures caused by ongoing transmissions while maintaining high channel utilization through continuous operation.
Solution Approach 2:
The patent introduces timing gaps and LBT opportunity windows as intermediary time periods between transmissions. These intermediary periods act as mediators that allow the second UE to successfully perform LBT without being impacted by the first UE's transmissions, while minimizing the overall impact on channel utilization through optimized timing.
Data Source
AI summary
The present application relates to a network device, UEs and method for resource allocation within COT under sidelink transmission. The UEs transmit information to the network device. The network receives information from the UEs under a sidelink network. The network device allocates resources within a COT, which is initiated by a first UE of the UEs, to the UEs according to the information.